503 CDUS41 KLWX 150521 CLIIAD CLIMATE REPORT NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC 1221 AM EST TUE DEC 15 2020 ................................... ...THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR DECEMBER 14 2020... CLIMATE NORMAL PERIOD: 1981 TO 2010 CLIMATE RECORD PERIOD: 1960 TO 2020 WEATHER ITEM OBSERVED TIME RECORD YEAR NORMAL DEPARTURE LAST VALUE (LST) VALUE VALUE FROM YEAR NORMAL ................................................................... TEMPERATURE (F) YESTERDAY MAXIMUM 44 4:59 AM 69 2015 46 -2 49 MINIMUM 34 11:49 PM 3 1989 27 7 38 AVERAGE 39 37 2 44 PRECIPITATION (IN) YESTERDAY 1.24R 0.96 1999 0.10 1.14 0.32 MONTH TO DATE 2.23 1.49 0.74 1.81 SINCE DEC 1 2.23 1.49 0.74 1.81 SINCE JAN 1 45.88 40.07 5.81 39.65 SNOWFALL (IN) YESTERDAY 0.0 3.6 2003 0.2 -0.2 0.0 MONTH TO DATE T 1.4 -1.4 0.2 SINCE DEC 1 T 1.4 -1.4 0.2 SINCE JUL 1 T 1.9 -1.9 0.2 SNOW DEPTH 0 DEGREE DAYS HEATING YESTERDAY 26 28 -2 21 MONTH TO DATE 322 368 -46 364 SINCE DEC 1 322 368 -46 364 SINCE JUL 1 989 1284 -295 1227 COOLING YESTERDAY 0 0 0 0 MONTH TO DATE 0 0 0 0 SINCE DEC 1 0 0 0 0 SINCE JAN 1 1406 1178 228 1524 ................................................................... WIND (MPH) HIGHEST WIND SPEED 25 HIGHEST WIND DIRECTION NW (320) HIGHEST GUST SPEED 34 HIGHEST GUST DIRECTION NW (320) AVERAGE WIND SPEED 9.0 SKY COVER AVERAGE SKY COVER 0.8 WEATHER CONDITIONS THE FOLLOWING WEATHER WAS RECORDED YESTERDAY. RAIN LIGHT RAIN FOG RELATIVE HUMIDITY (PERCENT) HIGHEST 93 8:00 AM LOWEST 56 11:00 PM AVERAGE 75 .......................................................... THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TODAY NORMAL RECORD YEAR MAXIMUM TEMPERATURE (F) 46 71 1971 MINIMUM TEMPERATURE (F) 27 5 1989 SUNRISE AND SUNSET DECEMBER 15 2020......SUNRISE 7:22 AM EST SUNSET 4:49 PM EST DECEMBER 16 2020......SUNRISE 7:22 AM EST SUNSET 4:49 PM EST - INDICATES NEGATIVE NUMBERS. R INDICATES RECORD WAS SET OR TIED. MM INDICATES DATA IS MISSING. T INDICATES TRACE AMOUNT. $$